.border::before{content:'';position:absolute;top:0%;left:0;height:450px;width:20px;background-color:#003594;z-index:9999;animation:grow-border 1s alternate}.border::before{content:'';position:absolute;top:0%;left:0;height:450px;width:20px;background-color:#003594;z-index:9999;animation:grow-border 1s alternate}